What are some techniques that help you stay positive?

My friend told me about a great "game" to play whenever you are in a situation that isn't working out the way you want it to.  Ask yourself, "what do I like about this situation"?  Take a moment and really think about it.  Try and find the good in a situation.  For example, I was on a cramped airplane yesterday.  I was tired, and of course, lucky enough to get the middle seat in the last row.  To add to it, I wanted to watch the tv program, but had misplaced my earphones.  Feeling frustrated, I remembered what my friend told me and I asked myself, "what do I like about this situation," and after some thought I realized, "hey, it is pretty cool that I am sitting in a chair, flying, at 40,000 feet in the sky".  It was also pretty cool that since my earphones were missing, I would take the remaining time on the flight and read, something I rarely feel I have the time to do.  I felt better right away.  It didn't take away the fact that I was sitting in the middle seat, but by switching my focus to more positive thoughts, it made it just that little bit better.  So next time, when you are getting hyped up, focusing on the negative, ask yourself that question and you will find it helps you train your mind to think differently, positively.  

Here are some other techniques I pulled from this website:  

1. Never respond when you are not calm. If you are not sure that you are calm, don’t respond. Take time to calm yourself down first.
2. Realize that you can find opportunities in negative situations. Albert Einstein said: “In the middle of every difficulty lies opportunity.”
3. Look at the content of what people say to you for something positive that you can act upon to improve yourself. Don’t just reject the whole messages.
4. For the rest of the messages which is negative, simply ignore it.
5. Realize that having negative feelings will just hurt you, not them. So there is no reason for you to have any negative feeling.
6. If you make mistakes, remember this quote by George Bernard Shaw: “A life spent making mistakes is not only more honorable, but more useful than a life spent doing nothing.”
7. Talk to a positive friend who can encourage you.
8. Remember your favorite quotes to give you inspiration and motivation. This is one reason why you should have quote of the day.
9. Look at the negative situations as your training sessions for real life. The higher you climb in life, the worse the negative situations would be, so you’d better be prepared for them.
10. Realize that you can’t please everyone. In fact, nobody can. Sometimes you need to just let some people go. Realizing this will relieve you from a lot of unnecessary burden so that you can focus on the people that you can positively interact with.